Wideband Channel Estimation for Multiuser Communication Based on Reconfigurable Intelligent Surface Assisted

LI Guiyong; DU Yizhou; WANG Dan

doi:10.11999/JEIT220775

Volume 45 Issue 7

Jul. 2023

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LI Guiyong, DU Yizhou, WANG Dan. Wideband Channel Estimation for Multiuser Communication Based on Reconfigurable Intelligent Surface Assisted[J]. Journal of Electronics & Information Technology, 2023, 45(7): 2443-2450. doi: 10.11999/JEIT220775

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LI Guiyong, DU Yizhou, WANG Dan. Wideband Channel Estimation for Multiuser Communication Based on Reconfigurable Intelligent Surface Assisted[J]. Journal of Electronics & Information Technology, 2023, 45(7): 2443-2450. doi: 10.11999/JEIT220775

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Wideband Channel Estimation for Multiuser Communication Based on Reconfigurable Intelligent Surface Assisted

doi: 10.11999/JEIT220775

School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China

Funds: The Natural Science Foundation of Chongqing (cstc2021jcyj-msxmX0454)

Received Date: 2022-06-13
Rev Recd Date: 2022-10-20

Available Online: 2022-10-25

Publish Date: 2023-07-10

Abstract

Abstract

To solve the problem of severe transmission attenuation of TeraHertz (THz) links, and the performance degradation of traditional channel estimation schemes caused by beam squint in wideband systems, a multi-user THz communication model assisted by Reconfigurable Intelligent Surfaces (RIS) is constructed in this paper, and a low complexity two-stage cascaded channel estimation scheme is proposed. In the first stage, the channel estimation problem is transformed into an objective optimization problem by using the sparsity of the THz and log-sum function, and the objective function is optimized by gradient descent method, so that the channel parameters to be estimated are iteratively close to the optimal solution, thus the typical user cascade channel is estimated. In the second stage, the cascade channels of other users are estimated with lower pilot overhead by using the strong correlation between the cascade channels of other users and the typical user channel. The simulation results show that the proposed scheme has better performance than other schemes.
- Reconfigurable Intelligent Surface(RIS),
- TeraHertz(THz) communication,
- Channel estimation,
- Beam squint

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References(22)

References

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